Spotting dark brown insects with distinctive rear pincers (forceps) scurrying away quickly when you turn on the basement or bathroom lights.
Detecting a strange, musty smell, which earwigs naturally release as a defense mechanism when they are disturbed or crushed.
Finding ragged holes, chewed edges, or missing pieces on your delicate indoor houseplants or patio foliage.
Discovering clusters of them congregating under wet bathroom rugs, near leaking pipes, or beneath damp cardboard boxes.